Looper mechanism for sewing-machines.



PATBNTED JULY 9. 19o?. I l

v M. AMMERMAN. LOOPER MBCHANISM FOR SEWING MACHINES.

'SHEETS--SIIEET 1.

APPLIATION FILED MAB. 15, 1904.

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No. 859,423. PATENTED JULY 9, 190,7.

W. M. AMMBRMAN. LOOPER MEGHANSM FOR SEWING MACHINES.

APPLIGATION FILED MAR.15, 1904.

ZSHEETS-SHEET 2.

UNITED l' STATES PATENT orrron.

WILLIAMM. AMMERMAN', OF NEW HAVEN, CONNECTICUT, ASSIGNOR TOTHE EDWIN J. IOOF COMPANY, F NEW HAVEN, CONNECTICUT, A CORPORATION'OF NEW JERSEY.

LOPER MECHANISM vFOR SEWING-MACHINES.

Specification of Letters Patent.

Patented July 9, 1907.

`Application filed March 15, 1904:. Serial No. 198,185.

To all whoin it may concern:

Be it known that I, WILLIAM M. AMMERMAN, a citizen of the United States, and a resident of New Haven in the county of New Haven and State lof Connecticut,

' v5 havep'invented certain new and useful Improvements filed March 15, i904,

The mainobjeet of the present invention is to render fa lock-stitch sewing machine of the class referred to capable of making a chain-stitch without other change than the mere substitution in the machine for the usual l bobbin-casc and bobhin-f a chain-stitch attachment r so-called loope1'.f One form of looper for thus rendering a lock-stitch sewing machine capable of 'makinga,chain-stitch isdisclosed in Letters Patent No. 629,735, granted to me July 25, 1899, ln the sew- .25 ing machine disclosed in said Patent, however, the

shuttle or loop-taker is operated to have but one revolution to each reciprocation of the needle, whereas in I the machine forming the subject-matter of my present application, the loop-taker is' operated to have two revolutions to each reciprocation of the needle, which difference of time in the `relative movementsl of said parts renders vnecessary certain changes in the construction of the looper and in its arrangement relative to the loop-taker in .order that it may properly control the thread in cooperation with the othci parts of thv,-l stitchforming mechanism in the formation lol a chainstitch; and it is. in such construction of the looper and arrangel nient of the same relatively to the coperating parts of the stitch-forming mechanismas will adapt a machine `of the class reierred to for making a chain-stitch that iny present invention more particularly resides, although certain features of the invention may be embodied in chain-stitch loopers for use in connection with other classes of sewing machines.

Referring to the accompanying drawings forming a part of lthis specification, Figure 1 is a front elevation,4

partly in section, of a sewing machine embodying my invention, ,'Figs. 2, 3, 4 and 5 are detail views showing the loop-taker and attached looper in front elevation {iO-,and the work-plate in section and illustrate the operation of the parts at different times during the formation of the stitch: Figs. ('and`7 are rear views of the -looperrin operative position relatively to the looptakerthe latter boing shown in dotted lines, and illustrates the lockngideviee for securing connection he- 'through the gearing ISI and thereto.

tween the parts in locking and unlocking positions respectively. Fig. 8 is an edge view of the looper removed 'from connection with the loop-taker. Fig. 9 is an enlarged detail to be hereinafter referred to. Fig. 10 is a central vertical sectionthrough the loop-taker, its driver, and its supporting race-way frame.

Similar reference characters designate like parts in the several `figures of' the drawings.

The sewing machine hereinfshown in connection with which l/have illustrated my invention is, aside from the chainstitch looper, of the same construction and operation as that more fully illustrated and described'in my said pending "application Serial No. 198,184, the same comprising the bed-plate l; the

overhanging bracket arm 2; the upper driving-shaft 3 I journaled in bearings in said bracket larm;A the vertically reciprocating needle-bar 4 actuated from the driving ,shaft 3; the rotary shuttle or loop-taker 5 sup-i ported in position at the under side of the hed-plate in the circular race-way frame 7; thc loop-taker driver lv having at its forward end a plurality of lingers 15 for engaging the loop-taker with in openings 16 therein, the said loop-taker being arranged with its axis at an angle to the axis of the driver whereby the driver fingers during thc rotation of the parts will alternately enter and withdraw from the openings in the looptaker so as to permit of the rec passage of the loop' taker through the needle-thread loop in the usual manner; and the means for transmitting motion from the driving shaft to the loop-taker driver so as to impart two revolutions to thc loop-taker to cach reciprocation of the needle, comprising the pitlnan-lever 29 (.'onnocting at its upper end with the crank 2G in the driving shalt and at its` lowor ond with the driver .I3

When this machine is `provided with thc usual bohbin and lmbbin-casc, it will operate to form the ordinary lock-stitch. 1n order, however, to adapt the machine for making what is termed a chain-stitch, the bobbin and hobbin-casc are removed lrom the loop-l taker and my improved looper is removably attached This looper comprises a forked tail 40 extending lrom a` supporting plateor body portion 4l which is provided with means for detachable connection with the loop-taker within the usual central hobbin containing chamber thereof whereby the looper may be held in fixed relationwith the loop-taker so as to be movable therewith when in operation, the said forked tail being formed in substantially the areof a circle corresponding to that o the loop-taker periphery so as to occupy a position adjacent to the latter when the looper is placed in operative connection with the loop-taker, When tho looper isplaccd in `operative connection wit!) thc loop-taker it will be arranged with both prongs 42, ll2, thereof terminating Cri vunder will] *t7 of tht* lttttywi* tht* ttstitil inztnnvr.

hrovvd ltmpcr cozintit-twl ihorttiifiith. tht* inJt-itint* i.-=

and ris'es, it thrtiii'i` ttttt. :1 limp (t nt tht* tht-vnd which ira 4iittthvgitn itstlvstfviit tn throw mit, thvsttt't'teuding hint,

.dnswndtttl hhhtw tht* hightmt pttint in tht* path ttf mortehy tht? lttttpm', httii'twer, it is in ,ion whit-h pt*i'inittt ttt tht* htttt'i' titift sttitl IOS pressing against the lever, is movably held. in a position 'to engage with the loop-taker within an opening 5/ in one wall thereof, as' shown in Fig. 6, and retain the looperv in operativeconnection therewith, the said i locking-lever beingarranged with its free end 55 projecting beyond one edge of the looper-body 4l in a convenient position to be reached by the operator to move the lever into unlocking position with its arm 53 withdrawn from the opening 5 in the loop-taker, as shown in Fig. 7, when it is desired to remove the looper from connection with the loop-taker.

.tion across the path of the needle to be entered thereby,

and actuating mcans'for the said needle, loop-taker, and

looper.'

In a sewing'machine, av stitch-forming mechanismcomprising' a'reciprocatlng needle, a loop-taker and a forked looper both having,r two revolutions to each reciprocationvof the needle, the loop-taker being operative during the first revolution to seize the .threaddoop thrown out by the needle and the forked looper being operative to receive the said thread'loop subsequent to its engagef inem :sy the loop-taker and hold the same during the second revolutioain an open or distended position across the path of the needle to be entered thereby, and actuating means for the said needle, loop-taker1 and needle.

3. ln a sewing machine, a stitch-formingr mechanism comprising a reciprocating needle, inloop-taker provided hold the same during another revolution in an open or di'st'ended position across the path of the needle tobe entered thereby, and actuating means for the saidneedle and the loop-taker.

4. In la sewing machine, a 'stitch-forming mechanism lcomprising a reciprocating needle,A a loopAtiiker provided fwith a forked looper and having two revolutions to'each reciprocatlon 'of the needle, the said loop-taker being operative during the first revolutionte seize the tlircad loop thrown out by the-needle and the forked looper Vbeing operative to receive the said thread-loop subsequent to'its engagement by the loop-taker and hold the same during the second revolution 411n an open or distended position across the path of the needle to be entered thereby, and 'actuating means for the said needle and the looptakcr. y y y In ai sewing machine, a stitch-forming mechanism comprising a reciprocating needle, a rotary loop-taker, a forked looper for receiving the thread-loop subsequentto v its engagement by the loop-taker and having .a cast-.off end .terminating in advance of tlieloop-taker beak and in a position radially beyond its path of movement, and means for imparting a plurality of vrevolutions to said loop-taker and looper to each reciprocation of the needle/ i. ln a se\ving.machine, a stitch-forming'mechanism comprising aA reciprocating needle, a rotaryloop-taker, a forked looper for receiving the thi'ead-loop`subsequent to its engagement by the loop-taker and having a cast-off' end terminating in advance of the A loop-taker beak, a loop-detainer extending past the looptaker beak from'a point at its rear to 'a point in advance thereof, and means for imparting a plurality of revolutions to said loop-taker, looper, and loopdetainer to each reciprocation of the needle. '1 I 7. In a sewing machine, a stitch-forming mechanism comprising a reciprocating needle, a rotary loop-taker, a forked looper for receiving the ythread-loop subsequent to iis engagement by the loop-taker und having o. cast oli oid terminating in advance `of the loolrtaker beak, a loop-dominer of less width than the forked looper ci(l lending past the loop-taker beak from a point at the rear to a point in advance ther and means for impartingl o plurality otl revolutioi to said loop-taker, looper and' loopdetniner to each reciprocation of the needle. i

8. ln a sewing machine, a stitch-forming mechanism comprising a reciprocating needle. a rotary loop-taker, a forked looper for receiving' the thread-loop subsequent to its engagement by the loop-taker and having a cast-off ond -terminating in advance of the loop-taker beak,a loop-defiector located intermediate of the said cast-ofi. end of the looper and the' loop-taker beak, and means for imparting a plurality of revolutions to said loop-taker, looper, and loop-deiiector to each reciprocation of the needle.

i). ln a sewing machine, a stitch-forming mechanism4 to its engagement by the loop-taker and having a cast-off end terminating in advance of the loop-taker beak, a loopdeilcci'or located intermediate of the said cast'oft end of thelooper and the loop-taker beak and having a portion .of its loop-detieetiney surface extended radially beyond for imparting a plurality of revolutions to said' looptaker,' looper and loopdeilector to cach reciprocation of the needle.

1i). ln a sewing machine, a4 stitclrforming mechanism comprising a reciprocaiimr needle, :i rotary loop-tnker, a iforkedylooper for receiving the thread-loop subsequent to its engagementI by the loop-taker and havinga cast-oit end terminating in advance of the looptuker beak, a loopAdelector locai'cd intermediate of the cast-off end of the looper and the loop-takcr beak and having a portion of its loop-detiecting surface extending rearwardly past the said beak in a position radially beyond the same, and means for imparting| a plurality of revolutions to s aid loop-taker, looper, and loop-deilcctor to each reciprocation of the ncedle. i

11.In a sewing machine, a stitclrformlng mechanism comprlsing'a reciprocating needle, a rotary loop-taker, a forked looper for receiving the thread-loop subsequent to its engagement by theflbop-taker and having a cast-oit end terminating in advance of thel loop-taker beak, a loopdeiiector located intermediate of the said cast-off end of at one side of thefloop-taker benk with a needle-receiving,r space therebetween, and means for imparting a plurality of revolutions to said loop-taker, looper, loop-deector and loop-guard to each reciprocation of the needle.

v12. n n sewing machine', a' stitclrforming mechanism comprising a reciprocating needle, a rotary loop-taker, a forked looper for receiving the thread-loop subsequent to Iits engagement by the loop-taker and having a cast-ofi end, terminating in advance ot' the loop-takerl beak, a combined loop-detiector and loop-guard extending past the loop-taker Deakin a position at one side thereof and with aneedle plurality of revolutions to said loop-taker, looper, and con1` the needle.

13. In asewlng machine, a'stitch-forming mechanism vcomprising a reciprocating needle and a rotary loop-taker having a plurality of revolutions to each reciprocation of the needle, the saidloop-taker .being provided with a taker beak and in a position radially, beyond its`path of loop-taker.

comprising a reciprocating needle and a rotary loop-taker' having a plurality of revolutions to each reciprocation the looper and the loop-taker beak, a loop-guard located' of the, needle, the said loop-taker being provlded'with a? .forked -tall or looper arranged ywith both prongs thereof'rcomprising u reciprocating needle, a rotary loop-taker, a forked looper for receiving the thread-loop subsequent' the path of'movement of the loolrtaker beak, and means Y lllO receiving space therebetween, and means for imparting av bined loop-deflector and 'loop-guard to each reciprocation of forked tail or looper terminating .in' advance ot the loop,-4

movement, and mea-ns `for operating the needle and the l 14. Ina sewing machine,v a stitch-forming mechanism f 'needlel'and tite loop-taker.

. taker heak. and with a lotm-detlectorinitiating in advance ol' the loopdaker terminating in advance of the loop-taker beak and havingr a loop-detainer extending pa t2 tho loop-taker beak from a point at its rear toa point in advance thereof, and means t'or operating the `needle and the loop'taker.

in a sewing;v machine, a stitch-.forming Amechanism compri. nf.: a reriproeatory needle and a rotary l0op-taker havin.;y a plurality ot' revolutions to each reeiproeation Of the needle. the said loop-taker bein"v provided with a forked t l or looper arranged with both prongs thereof termina ting in advance ot' tite loop-taket beak and havingr a contracted loop de liner shank extendida; past the loop4 taker beak from a point at the rear to a pointA in advance thereof, and means l'or operating the needle and the loop taker, l l

ttt. ln a sewing marhine, a stitelrforming,r mechanism comprising; a rta'iprm'atinir needle'and a rotary loop-taker having a plurality ot' revolutions to eatflt re procation of the needle, tht` Said looptaker being vprovided with a .forked tail or louper terminating: in advance ot' the looptaker beak, and with a loop-detiector internttalia'te of the Aaid forked tail and th(l ltiolrtitlier beak, and means t'or operatltn,r the needle and the loop-taker.

17. In a :sewingr machine. a Stitch-fortuit meehanisrn eomprising a reciprocating needle and a rotary loop-taker having' :r plurality ot revolutions to eaeh recproeation ot the needle, the Said forked tail or loo 1er terminatingr'in advance of tite looptaker beak, with a loop-iletleetor intermediate of the said forked tail and the looptalter beak liaviI-'iir` a portion of its loop-detlecting wall extended radially beyond the path oftntovement ol the said beak, and means for operating; the

laf ln a' sewing machine, a stit'cli-ttn'niim,r mechanism comprising a reeprocatimr needle and a rotary loop-taker havin.;Y a plurality of revolutions to each reeiproeation of the needle, the said loop-taker beingr provided with a torked tail or looper terminatingr in advance of the loopintermediate ol the said forked tail and the loop-taken beak having a portion ot its` loop-lettoriina' wall extended rearwardly p the said heal: in a position radially beyond itl pat h oftnove nient'. and. means for operatingT the needle and the loopit), In a sewing machine, a stitch forming mechanism eompr'iin; a cooperating.: needle and loop-taker, lthe said l0op-taker beiner provided with a forked tail orlooper teri beak and havin;r a at'one sidi.l and in ci'iperation with the he path of movement portion thereof arranged in al position advance oi the loop-taker beak tor needle atV that side-thereof opposite t of the loop-taker beak,

510.' A rotary loop-taker provided with a forked tail lor looper terminatingy in advance voi the loop-taker beak and operative to rereive a thread-loop east: oli,` from the beak, and a loop-detleetor intermediate ol', said forked `tail and heak operative to engi-tee a thread-loop east otf `from tite forked tail.

2l. A rotary looptakerlprovided with a i'orked tail or looper terminatitn.: in advance ot' the loop-taker beak, and with a loopaletlefetor intermediate ot theysaid forked tail and the loop-taker beak having.; a portion ot' its loopdetleeting wall extended radiallyv beyond the said beak.

, A rotary lonptaker provided with a forked tail.0r

loop-taker. bein;v provided with a loope looper tern'iinatin;r in advance of the loop-taker beak, and with a loopaletltwtor intermediate of the said forked tail and the` loop-taker beak havinrT a portion of its loop-deA fleeting;r wall extended rearwardly passed and radially bevond the said beak. t Y

'A rotary .loop-taker provided with a forked tail 0r looper arranged with both prongl thereof terminating in advance of 'the loop-taker beak, and with a removably attacked loop-dotierten' intermediate et tite said forked tail and the loop-taker beak.

Zl-t. A rotary loop-taker provided with a forked tailor looper arranged with both prongs thereof terminating in advance o1' th loop-taker beak, and with a loop-detleetor intermediate ot the, Said forked tail and the looptaker beak. the said forked tail and the lop-detlef-,tor being connected together 'and removably attached to the looptaker.

2T. A rotary loontaker provided with a forked tail or lt-nper arranged with ho'tlt prongs thereof terminating in advance al' the loop-taker beak, and with a loopdetteetor intermediatel ot`tbe said forked tail and the loeptaker beakv the said -t`orked tail and the lootrdetlector hein),r formed in one integral part and removably attached to the loop-taker. i

. A rotary looptaker provided Awith a forked tail or looper,.a loop-doileetor and a loop-gt1ard, the said forked tail terminating in advance of the looptaker beak and the loop-detlector and the loop-guard beingr both arranged in advanee of the loop-taker beak.

2T, A rotary loop-taker provided with a forked tail or a loop-detltwtar and a loop-guard. the said forked tail terminating in advance ot' tht` loolrtaker beak and the loop-dettector and the loop-guard being both `arranged in advance of the loop-taker 'beak and the said forked tail. loop-detlector. and loop-guard lall bein.;r formed in one part and removably attached to the loolrtaker.

2S. A rotary loop-taker provided with a forked tail or looper arranged with both prongs thereof terminatineT in advance of tite loop-taker beak and having; a shank portion extended past the said beak to a point in advance thereof, the said shank portion having one '.vall thereof servingl as a loop-detlecior.

20.. A rotaryv loop-taker provided with a forked tail or looper tern'iiuating.: in advance of the loop-taker beuk and having a shank portion extended past the said beak to a point in advance thereof, the said shank portion having one vall thereof serving as a leop`gnard. y

titl. A rotary .loop-taker provided with a forked tail orlooper extending' in advance of the loop-taker beak and having-a shank portion extended past: the -@aid beak to a point: in advance thereof, the said shank portion having one wall thereof serving; as a loop-detlector and another wall thereof serving.: as a loop-guard.

31. A rotary looptaker provided with a forked tail or looper arranged with both prongs thereof terr'ninating in advance ot the loontaker beak and bavim,r a contracted shank portion extended past the said beak to a point in advance thereof and :serving as a -loop-det'ainer. v

` Signed at New York in the eounty of New York and State of New York this 10th day of March A. l). 1904.

WILLIAM M. AMMERMAN.

Witnesses Citas. F. DANE, E.4 M. FAITH.

CJI 

